I have doubts about intercontract communication

Question

I have read that:

In order to call an inline action, that is to call an action of contract A from contract B, there is a need to set some special permission. In this case, the Ram payer for the action in contract B must-have “accountname [email protected]” permission in its active. In a case, if account C needs to call an action in account A through a contract in account B, then account C need to set the [email protected] in its active.

But I observed that:

1. Contract B must-have “accountname [email protected]” permission in its active even to call function from contract A & not “accountname [email protected]” permission in its active.
2. If account C needs to call an action in account A through a contract in account B, then account C need to set the [email protected] in its active. This is true but is there any alternative that C can use contract B to call action from contract A without changing its permissions. Because in dapp it is not feasible for every user to do that.

I'm confused a bit about the all this. Can anyone please give me a clear guidance? Also, in accordance with the v2.0Latest version

Answer 1

If a contract has an inline action, the permission for running that action must be eosio.code from that contract account. Thats it.

Example: accounta is a smart contract with an inline action to accountb. Therefore accounta will need the permission [email protected], as the contract will need to execute the inline action.